[fpc-devel] volatile variables
jonas.maebe at elis.ugent.be
Thu Jun 30 11:45:00 CEST 2011
On 30 Jun 2011, at 10:42, Michael Schnell wrote:
> On 06/29/2011 09:44 PM, Vinzent Höfler wrote:
>> That's Ada's definition of "volatile". C's definition is less
>> stronger, but
>> should basically have the same effect.
> Nice and what is the FPC definition ?
There is none. FPC has a "volatile" modifier in svn trunk, but it
currently only affects the node tree optimizer. There are many other
parts of the compiler that completely ignore it (from the inliner to
the i386 assembler peephole optimizer), and hence it is probably not
that useful in its current incarnation.
If such functionality were properly implemented, the final behaviour
and definition would however probably be pretty much the same as the
ADA definition Vinzent posted. However, as has been mentioned several
times before: "volatile" has absolutely no use to make programs thread
safe. Its only use is for memory mapped I/O.
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